import graph;
import arrows_pi;

pen p = linewidth(0.2mm);
defaultpen(fontsize(10));

draw((0,0)--(20,20),arrow=Arrow(HookHead));
// draw((0,0)..(20,20)..(25,30));
draw((0,0)..(20,20){up}..(25,30){down});
draw((0,0)..(20,20)..(35,30));